I’d always been a bit of a jokester (thanks, Dad), and meeting a fellow student at Teachers’ College who also appreciated the double entendre, and not only she, but meeting her in an English course taught by Pat, a drily ironic punster, that first year was a hoot.
Other students would wait for some wise-crack or other. Of special entertainment were the occasions when the three of us, in the midst of a lecture/discussion, would follow a tangent and chase every terrible pun we could fit into a chain of one-liners.

Because of this habit, I got away with an enormous GOTWK (goofup of the worst kind) simply because other students (another paper in the course) who knew me thought I’d made one of my usual bad puns. And it was bad, as I had not at that stage read every word in the dictionary*.
The discussion of the moment was aimed at making us rethink our motivation for wanting to be a teacher.
“What would you have chosen if not teaching?” was the topic.One girl stated she had thought of taking up penal psychology.

Mass crack-up at my “joke” that wasn’t throughout the room (I Really Did think that was what she meant and Was Genuinely Surprised at her choice), and the would-be penal psychologist turned beet red, and shot me a filthy look.

Hours later, back at my flat, I realized she had Not meant “penile psychology”! Oh the shame! I kept my head down in every lecture the next day, and still snigger at myself for being so D-U-M-B!!!

* …still haven’t. Goof-ups continue, though thankfully more rarely these days